Invoice and quotation are two of the most common business documents — but they serve completely different purposes. Confusing them can cause payment disputes. Here is a clear breakdown.
A quotation is sent before work begins. It proposes a price — it is not a request for payment. A good quotation includes: your and the client's details, itemised work with prices, a validity date, and terms and conditions.
An invoice is sent after work is completed. It is a formal request for payment. Once sent, it becomes a legally binding document. It must include: a unique invoice number, invoice date, due date, itemised charges, tax details, and payment instructions.
Switch between Invoice and Quotation mode in one click. Your items, logo, and details carry over automatically. Create a quote, get it accepted, then convert it to an invoice instantly.
Yes. In ToolsLoop, switch from Quotation to Invoice mode at any time. All your items, rates, and client details carry over automatically.
A quotation becomes legally binding when the client accepts it. Once accepted, you and the client are bound to the agreed price and terms.
For significant projects, yes. A signed quotation protects you if a client disputes the price later.
The most professional workflow is to always send a quotation first, get it accepted in writing (by email confirmation or signature), then deliver the work, and finally send the invoice. This sequence protects both you and the client: the quotation sets clear expectations about price and scope, while the invoice serves as the formal payment demand with a legal trail.
Never start significant work without a signed or acknowledged quotation. Even a simple email from the client saying "yes, please proceed" creates a record that you both agreed on the price. If a client later disputes your invoice, an accepted quotation is your strongest piece of evidence.
Always include a validity period on your quotation (e.g. "Valid for 30 days"). This protects you from clients trying to hold you to an old price months later after your costs have increased. The ToolsLoop Quotation Maker has a dedicated "Valid Until" date field that appears clearly on every PDF quote.
ToolsLoop lets you create both invoices and quotations from the same tool. Switch between Invoice and Quotation mode in one click — your company details, logo, items, and prices carry over automatically. Download professional PDFs with no watermarks, no signup, and no fees.